The video focuses on the basic GMC specific diagnostic error code.
Contents:
0:21 Basic DTC analysis according to OBD2 protocol standard.
1:48 Insight into programming
- an explanation of what a bit is and how a byte is formed
- decoding the Error Code to the base programming
2:58 A diagnostically understandable description of the Diagnostic Trouble Code
3:05 Basic error definition
- Possible causes or errors of the car and its parts describing the mentioned error

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Make:
GMC
Code:
P2440
Definition:
Lost Communication With Vehicle Mode Status
Description:
Key on for 800ms,and the DME detected that it has lost communication with the Vehicle Mode Status during its initial startup for 40ms (2 message cycles).The Engine Control Module (DME) communicates with all databus-capable control modules via a CAN data
Cause:
DME has failedTerminal resistance for CAN-bus are faultyCan data bus wires have short circuited to each other

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